Def Leppard

The NFL returned to London on Sept. 28, and the members of Def Leppard were on hand to amp up the action -- minus guitarist Vivian Campbell, whose latest round of cancer treatment forced the band to seek sub-in help from Trixter's Steve Brown.

Def Leppard guitarist Vivian Campbell sounds just as upbeat as ever about his chances of beating the Hodgkin's lymphoma he was diagnosed with in 2013, but his latest round of treatment will keep him off the road for a series of upcoming live dates.